The patient has mild systemic disease that does not limit their activities (e.g., controlled hypertension or controlled diabetes without systemic sequellae)

III

The patient has moderate or severe systemic disease, which does limit their activities (e.g., stable angina or diabetes with systemic sequellae).

IV

The patient has severe systemic disease that is a constant potential threat to life (e.g., severe congestive heart failure, end-stage renal failure).

V

The patient is morbid and is at substantial risk of death within 24 hours, with or

E

Emergency status: In addition to indicating underlying ASA status (1-5), any patient undergoing an emergency procedure is indicated by the suffix "E". For example, a fundamentally healthy patient undergoing an emergency procedure is classified as 1-E. If the patient is undergoing an elective procedure, the "E" designation is not used.

The American Society of Anesthesiologists(ASA) physical status classification serves as guide to better communication among anesthesiologists about clinical conditions of patients, in the way to predict their anesthetic/surgical risks -as higher ASA class, as higher the risks.